I have had a play but I think without some tuition or some serious YouTube hours you would struggle to get a decent workflow out of it. That said it is a VERY powerful bit of software with support for many high end cameras.

Yes. It is absolutely the best way to preserve the inherent beauty of Nikon video. That said, it's very different because it uses nodes instead of layers for color correction. If you want to learn how to use it the best instructional videos are https://www.youtube..../goatseyeviewUK

However, for simple editing, I would recommend Photoshop because you can work with colors just the way you do with still photos.

That said, if you want to get into a professional editing environment, Resolve is great because even if you don't want to get into color correction, you can do your edit in Resolve and then hand it off to a colorist with zero fuss.